Numerical Simulation Applied in Identification of Roof Bed Separation for Mining Thick Coal Seam Under Nappe Structure

World Multidisciplinary Earth Sciences Symposium

Gui, Herong^1 ; Hu, Rongjie^3 ; Kang, Zhiyong^2 ; Qiu, Huili^1^4 ; Li, Jun^1^4

Suzhou University, National Engineering Research Center of Coal Mine Water Hazard Control, Suzhou, Anhui, China^1

No.115 Prospecting Institute of Coal Geology of Shanxi Province, Shanxi, China^2

Wanbei Coal-Electricity Group Co. Ltd, Suzhou, Anhui

234000, China^3

Anhui University of Science and Technology, School of Earth and Engineering, Huainan Anhui, China^4

关键词: Complex geological condition;    Elastoplastic finite elements;    Fractured zones;    Fully mechanized top-coal caving;    Large mining heights;    Nappe structure;    Pattern of stress distributions;    Tension analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/221/1/012091/pdf
DOI  :  10.1088/1755-1315/221/1/012091

来源: IOP

【 摘 要 】

In China coalmines, economic losses and human casualties inflicted by roof bed separation water have been acutely severe in recent years. This article takes the engineering case, mining thick coal seam under nappe, in Xinji No. 1 Coalmine in Huainan mining field. Given the low tensile strength of lower roof bed under large mining heights, numerical simulation is applied to No. 1307 fully mechanized top-coal caving (FMTC) working face by coupling elastoplastic finite element model (FEM) in rock mechanics with "no-tension analysis" (NTA) to map out, in the roof bed, pattern of stress distribution and the maximum heights of caving zone (37m) and of water-conductive fractured zone (98.5m), quantitatively delineating the location of bed separation. Specifically, bed separation F is the closest to the water-conductive fractured zone (by merely 1.93m) and of a maximum width of 6.4m, flagging a major threat to mining safety. These results are further corroborated by exploratory drills. Outcomes can be of reference to other coal-mining countries when identifying bed separation and treating related water hazards during mining under complex geological conditions.